Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 16-17, Pages 4497-4504Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.03.105
Keywords
Plastic strain gradient; Microbending; Springback; Size effect
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Funding
- National Natural Science Foundation of China [50835002, 50975174]
- German Federal Ministry of Education and Research BMBF [CHN 08-041]
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In order to investigate the springback behavior of pure aluminum foils, scaled microbending experiments with different thicknesses ranging from 25 mu m to 500 mu m were carried out. In the experiments, it is observed that springback angle increases with decreasing foil thickness, which indicates obvious presence of size effects, and is attributed to plastic strain gradient hardening. So a constitutive model, taking into accounts both plastic strain and plastic strain gradient hardening, is proposed to analyze the microbending process of thin foils. The model is based on the relationship between yield stress and dislocation density, and is adopted to predict the springback angle after microbending both by analytical expressions and by FE simulation. It is confirmed that the predictions by using the proposed hardening model agree well with the experimental data, while those by using conventional elastoplastic model cannot capture such size effects. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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